Whether the recipes for selling stewed vegetables online are infringing depends on the originality of the recipes, whether they are protected and whether they are authorized by law. Here are some related considerations:

1. Originality: If a marinated dish formula is unique and developed by itself, it may be regarded as your intellectual property, such as trade secrets. In this case, it may constitute infringement for others to use or copy this formula without your permission.

2. Public domain: If a marinated vegetable formula has been widely spread in the public domain, there is no clear originality and it is not protected by intellectual property rights, then others can freely use the formula.

3. Trademark: If a certain brand or formula of stewed vegetables has been protected by trademark registration, others may use the same brand or name to infringe the trademark right. Generally speaking, it depends on the specific situation to judge whether the marinated vegetable formula involves infringement.